Roy Geary was a person of great distinction, recognised for a wide range of achievements. He was a first class mathematician who made significant contributions to statistical theory. He was an Official Statistician of distinction and he made great contributions to the development of economic statistics and to the use of statistics for policy purposes in fields as diverse as demography and economic statistics. He was the first Director of the Central Statistics Office when it was created in 1949 and I am delighted to be asked to present this lecture in the CSO’s 50th birthday year